Javascript预解析相关一则
先来看一段代码:
alert(”a” in window); /*true – 1*/
if( false ){
var a = 1;
}
alert(”b” in window); /*false – 2*/
if( false ){
b = 1;
}
alert(”b” in window); /*false […]
先来看一段代码:
alert(”a” in window); /*true – 1*/
if( false ){
var a = 1;
}
alert(”b” in window); /*false – 2*/
if( false ){
b = 1;
}
alert(”b” in window); /*false […]